Proyectos de Subversion Moodle

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1 efrain 1 
<?php
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declare(strict_types=1);
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namespace Phpml\Math\Statistic;
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use Phpml\Exception\InvalidArgumentException;
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class Mean
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{
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    /**
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     * @throws InvalidArgumentException
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     */
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    public static function arithmetic(array $numbers): float
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    {
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        self::checkArrayLength($numbers);
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        return array_sum($numbers) / count($numbers);
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    }
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    /**
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     * @return float|mixed
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     *
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     * @throws InvalidArgumentException
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     */
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    public static function median(array $numbers)
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    {
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        self::checkArrayLength($numbers);
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        $count = count($numbers);
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        $middleIndex = (int) floor($count / 2);
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        sort($numbers, SORT_NUMERIC);
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        $median = $numbers[$middleIndex];
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        if ($count % 2 === 0) {
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            $median = ($median + $numbers[$middleIndex - 1]) / 2;
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        }
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        return $median;
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    }
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    /**
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     * @return mixed
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     *
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     * @throws InvalidArgumentException
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     */
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    public static function mode(array $numbers)
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    {
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        self::checkArrayLength($numbers);
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        $values = array_count_values($numbers);
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        return array_search(max($values), $values, true);
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    }
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    /**
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     * @throws InvalidArgumentException
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     */
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    private static function checkArrayLength(array $array): void
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    {
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        if (count($array) === 0) {
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            throw new InvalidArgumentException('The array has zero elements');
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        }
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    }
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}